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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f432d0344a9431090e00560b89699380d59a256b0457799c12a4370126f8b7' 
  AND token = 'WUM9pN3rW6lvYCo1RRZrK8wIkf75sYH3pk1BAJk+COQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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