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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db1f08906dea6171ac5af4ed7bd45e0088fb3709ece60f16f8a6a2c8a8a1178' 
  AND token = 'IS0EJ6nLZk+hRcc3QS9CGaB2PNCrtscpvpam70+X0JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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