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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c4b314163ccda704dd4e8643a86c265dea14ad9b2f6fe9981aec29a6cb3f36' 
  AND token = 'zTllRd76BBetWyC7IvfgEkNNy7IKa2AshgZiRY4bq0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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