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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916dc692088397198d6214228afd860e4636925ce6fe9ebdd936803a521261ca' 
  AND token = 'd53MQrrwT1387Bvy6Bbs6NliN1jRBNZhQEHq2M+nEhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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