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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83cd1bd505f8cc6185b7da4dcf8bbfa252debd6a2b239bd5a89743f79603d61' 
  AND token = '0aD5OzLseZYF5fogIxrkMs5HWM8fSCOXKFL1jzi7UmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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