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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7dcb9aa7e80957519f85f4c08a4134c0c3efba8b499e0116f7cf06ce795988' 
  AND token = 'xeCWqU6roMPuJmuHnAFk+iS6h51IpUyKZZzZkmZBcA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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