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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570240b4ebeae2de202ac586aa9f1e32d25d6b001846fb4e0af4480e3e8d04ae' 
  AND token = 'GA/hnvlwrPMLTjZ9UlHCftGBYvDw7Ov2zf1ZhuM7eZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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