SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c1b71366fb5a6f05101c276486d50225b3fa217955cff8d0b0be25cdb4e429' 
  AND token = 'oqRftvEUFzBkMHUKlgY8p8wbAFT73Jj8ZxzrgYtuuf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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