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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c40f61589fc64666c08ebbb89b94d7406d645510b51e40cd258bc934ebfadd' 
  AND token = 'gbogNWQHwWA2IkZ/E3xJKx5ii24E9gnSTWUl6JncFfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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