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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9770219ab39715dbce1c834a5d261859797584df017c37d7380c9500ea687d' 
  AND token = 'odJ/vzRGydhMcRePHTniNSkvri6/nxn5Z9A28rog2Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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