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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda02bc9f58e210f68b6de8abad0354399257c84aa6af721484d76a5286ad797' 
  AND token = 'xi0TpedqTGoZ/VjkVJQmn0DacenwinfMQyk5A7ihXVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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