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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5198e04a021011f02ef072d11a2518b0fa649d081d2cc11b21dcc02515654a90' 
  AND token = '5FfVioUdN+v61B0/0s/Q5xHWEXTYZZejrI5VUNFfJTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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