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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f8e514f38d837a739da1b50ccbf48bfe9410b2f11d38ea3851d2efc8a39d3f' 
  AND token = 'ElQAd5H3J1f7mKt0ZUihqP5YCEOteCC7eUmRv3n73Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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