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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6d872f467f29fdbe3b047ae113f276d6f5a8253d41947d325c7145861ecc46' 
  AND token = 'Dvo1d4IKtWH79CeDUpzgP0yMGWMCHMVl2GKxC4J1XtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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