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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0126b9564de1671b4a869516ff58f29a5ee9cdf8bc7b4451c317c6f45ef4bcba' 
  AND token = 'VALkbnLNEkvmFzY40ktQuJq7sp8f+A+YpijWIURLIo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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