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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e530bff59d28231876ecea2c1b943c88aada844afe3cbbd9c000406d073f484' 
  AND token = '2/ufcwtdM95Uhe1leLrRkUHFTuieRGHl7eFKQiYp/9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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