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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821c4cd439d24abe13c00616dc3db0dfc7c3414ba1c2353c9591983323c47d7b' 
  AND token = 'cOeqiQHE8srTD0u7YezjnDleaTC+zmyC43TxUzfmY8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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