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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb2f86dc71b93b82e7a67804776d760e217358333db12473ea4ec096629a383' 
  AND token = 'i3rtKCK9qZApQNrrgovS/E9iNq+ou3bgvPpzfbVI+EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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