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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74ca412115f3530a70b1e63d7fc8f374f845a45e8753e63f2794fd8cf0d9d9f' 
  AND token = '1GAZYmO3fp//FJUmM60jMYcBylqrvmZbQk138aA7dWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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