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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb663c1a70770d15243296d323f30a8bf03801aefbfdcc4e2aeb6411bc5e3593' 
  AND token = '1l8OWIAqNX5V27RZVD4f2v16Aj9tNtfv9koSr7Vlhww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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