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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b6255accdb6ce6d4a24023ffd97959f9c19be0e5e634703fb5b85a6c57eaae' 
  AND token = 'm18+ny/zwMshnE9A9hFcKombrRaX4iw6vKfl2XrGwtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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