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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0328347e4168a076f62410b5a6b661b27aa09b67f4d5a5e61b1240f75584abb' 
  AND token = 'snox3joKa9Iw4xB7bCmj36VxJ5XwTPoH9qOt2PSVrjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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