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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf5884039fd76edd342996afc2e064422d0b00c13d07099a665f324adf1c92c' 
  AND token = '2ipBQj2EkxNC6nILL0jPnToVXszaY6o4wUo7uu9krKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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