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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0e612a5a4e2b76c8bb43b753919eada142c81f2ba268de4e6404c44acd5121' 
  AND token = 'LJrAV7ZJbu9VolbyPNRjZ2ZCfucaJTVH0h98KvVK/KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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