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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1742fcdc6af2c3c2db86af02ad65a964793d4f02cd5416c7174ba032eb665f' 
  AND token = 'K1pAWs2VT1SjftOwT+tPmFXibtq+/PaCGInfyq/DzwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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