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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c72c88775bc0596fd62cfa3c5f1cb8a2abdf6c88b68a09de841b8d6c84ad67' 
  AND token = 'FKFcHySXLdIWcLc575QktnCBu2/n0kxGok+/gFKs7Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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