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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3eb674a6987396062c40733cbcb747e10ee2474fbee2e538655868b23be04d' 
  AND token = '9YIuoV3XvbYeYcv84MhK9so/1q8ryGGMw1jOicQ0g24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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