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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e19cae3a9c6a140a03d20a1e7cb9303d3ac55e6a6924208e8cb6adb56cf80b' 
  AND token = 'FkLxG0ItQXBbAj8ZZv4X5c6xf9vfGcTjU3HFFy9hWMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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