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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15c596b6228ed01a954ae3adc1c0d4cc0643dbfc827818e7aea98bfdefc55cd' 
  AND token = 'GQ59Ev1M0uN9V9byrav6HKTR+gemCXRu05mh9gZd8GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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