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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99f55d4289068abe0e22f54d85b16cfa2b177244a4ce2b202b026d4b3db7106' 
  AND token = 'RwdY+QA2Gdif6GYkOVP33QnxYj7NhIbI6hvd9TnahQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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