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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156579314f46db02563b40340ad4450ee3f8eddeea61cafe8740ef8eaaa8c657' 
  AND token = 'Sc4hVJh97R2TRv/O4iTTVjHyKHDugtztEEZmBRXWXQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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