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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b1943fbfe7ac1e06cbe6f01b6456a4c08af27fe76db05882e490593844807e' 
  AND token = 'bPE9Q+01+rMnE+VCFDnX9gY0WAaCj7wqxCvMjpYxuJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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