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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c0f3531fcda8ce72d8fd5bb7b932cd9d8a1fb71b5f217076ddbd6cb763128b' 
  AND token = 'oOSq+oCKlny/pymESICczfWY4OoVlp2tdzpad4Vx+D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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