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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30179eb987b5c235d28b089cfbeef8d06072013e4b627da1392df08b70263d62' 
  AND token = 't9W9lkUpgxfGdIo30CUdlq/35s7KQMxngVjjd7zcySk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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