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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b75618b03430f83bf64cbad17eb3e30acc19adb3b5fd114ffab4bd38a165fc' 
  AND token = 'CqfMsjQXeF+Q7ybzdnLwv5MLVDLozIMvpQ6TTJhu8Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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