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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa9067837e3daca738c7eeba6afebaed6089eeae67bda5af11de8053ee539ab' 
  AND token = '3H8t9oUYUDK+yipRRxmaP/qW/y0uP4HtImjWDeFgztE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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