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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7acb558ddcf5943d75fd743d1b92a61550ebaafed5a440011c3469bfd9c56d' 
  AND token = 'J0GAc9UyEu0YISu2sHwkYOc1YwTlFYO5NEHwRSx6we4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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