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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4cbc1f435feb3481e66c44a39817915e110d95e1eb89c523bd05f0c95b3347' 
  AND token = '11vL0U3hryO3330jxo2Bj2e/DOsoCN17hDCe3ZY9gkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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