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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574b9df9019f7c88e900dd128e165c86a7c3e6b1a56bbfa47e534100268adf91' 
  AND token = 'q9xiaYpEkOewoWs8QNDwQSxsC5xw3IgVOwZiKQ6jiYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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