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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716a0d31c19daf61ddfbae24c3b806e49bae37eb6d4059d693453096a92b29cf' 
  AND token = 'GpWHUZ+v47bep5CVYkccyAiwLJvwd+D1dnCyBlQpcy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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