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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcb892147d6c0caa95c0b4a08ba8f6796c4773a661b8b918be08bb33dd4d3d5' 
  AND token = '9gqGg3hF9bmznN+I19Bl/ehPeLqiMVw3U0IqMkOzgIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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