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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12471cbed7e2e24a4004f0752ce230f4f070c8a5763810dc773720db8d092052' 
  AND token = 'sqf76EHtWe2dy/QH+hphSw8zgll8+LaG/2/UkbRYD7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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