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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fb24a1ddb32daa2d7ef185a9de0fbcf9b24c055caae7d709e4a1a2acc8362d' 
  AND token = 'x5vv0fgA91s5gUu74mM1tu+2yVMTD0OjswvV3kWf5Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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