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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9652c6ac1bf35356f742fdd95d1ce28ece06172f8a7914a86f129119447907' 
  AND token = 'lAMQT7mFIWbqeSg+IQovoYFHC59pIra8tXyDtUWgy0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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