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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e9a920f8f8658e4fa7dd4e2c358a2becffa14c63117110573963336bf6439a' 
  AND token = 'yaF0L75/7U9NyIqgi05lSlKsg1fLCFYWoppiKn9RvhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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