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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebaac93019dd07ba19e8db96695c8a34eac4f7fb597afe52887f0c99a21e799' 
  AND token = 'TDXmDFh/X6XfEBo9R4dMBfFE7rAFIVabrCH0xXzoF+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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