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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad51e26934ab8155d91ac4efd41f50f1840e6a43922892064629fdbb9b73d4f3' 
  AND token = '/n3rWKLlNJDSDIbc6w2rGxAacm1e7UwuMkASr2kvJoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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