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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc63747d61ca44163023a6ccc00bbe776c25ca6d6a56d165230c9ff082cc4295' 
  AND token = 'mR0VtMUxW2R7GqCFsAIQ4V9q4v+Nmq53tbQX3JfxrmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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