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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beab1d636c41a949e71248b646ccce42e7d513656274356c35824cca34ef03b2' 
  AND token = 'LspkyLf/R3LcTY/VKLgIvJk4Y+wfCVbcBz0a5TGTyVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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