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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874ae3005c74937d7d36a9b26a72c91769d773eacdd925a5df773a0c23bc00a4' 
  AND token = 'c+SCOKv2aQ+UglBnspXZvJAmUQ09a3gNhboD8OgphiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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