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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a31274b654ae4b1b97b48c20cc397277547eeb4a4dd4d4e4295e809650a4f6' 
  AND token = 'sL3PAC5oKpk/w1al94EN5l9D78Htx8wbbZUrQhZtGhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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