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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19ac0aa759deeba8b451a27c029d4c8fd59927dafd7b81569e94cc02144b8c7' 
  AND token = 'AFfQmc8LZ47Rn/FRmhLbLZNAIgCDM/MP62PiHd7/Bz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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