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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241d8a85ded9e840d4e9554d36dc5e15279d1273c06c076c5959bd4e536cd88d' 
  AND token = 'mzck8KwyL78S4qS5RsIPfE5YotO8l+KEW1Bz91++qwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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