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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fc49114b0063b4fb32abbd26cf84b5ca7127365ab62270f7cbd38caceb99a9' 
  AND token = 'sr8FuWnerPO0wVOh/yxW/BXBoKI08C5AtBrSeSuR73M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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