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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929f5ff6747283e0c8a7171169cb2e3fddb6114b5bb1d83251d56c0835f4ec36' 
  AND token = 'YjfRf26tCzE3RyrcZ61f2AdwaePcbP/ZmlztyBSKaq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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