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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff5556c3666db96aa430f686624da02da3a69e712a394b335680e22eba7b999' 
  AND token = 'r+HcCh/EraKyg7Tv3YX+wd0/pPeOz88gjjanJw3QCEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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