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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06caba76ea0f352b8717e773a1133a4e0c7fba6146db633d61873de6f17e0701' 
  AND token = '7GqI55K3G6JwjlOYn0kuLTNp0C24BUdZOt0jE7+U2Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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