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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f3dca039d00430db3e3f61099db9375e169111466ec408319059460b5ae8e7' 
  AND token = 'bNfzVctE2w0zpukNj97OSghFhdz5ypts7/9QI7UH7WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}