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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198bbbd00a466e2bf66a4e866170f8ec4fd1ba15a8c901d7e9db7eee688b0af3' 
  AND token = 'puWc6tHMQcmNdFcBGkFczUUmTJC0BiGCK6K5gUNcoAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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