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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5359ac19614c07b3f449c2bf19268a9d84490e72d96db190a94f7a1462dbc8b1' 
  AND token = 'GDNiKS13eljs+uGePPItu8sJr8A3AGA+scv0V+H13Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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