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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feddf53f3d11aeaefe5dc00f518d871ed4f8f60f6b997ae76d5227efc31f9f13' 
  AND token = 'wnv6DquzN+RiIhTpsILFRwp+AooW3xL+ZREkq8ewxzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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