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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dd02f415b1b4697676c91327057a2cf51199d5d1ea194df56ea0f88142afd8' 
  AND token = 'rX6D6DzKa/zBETNhzSo+mMdRXSNHxxFqjn7mPEPF+x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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