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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e223d8e99c1252f5a3cfa598028d40613727dde9309f09f4fe09ce5696d0819f' 
  AND token = '935fUPm6R/75tp6W69dGomLOgF7FKiTw43XN7+eVgbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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