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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874dae32a15aff97da09d6279343395a43e260b4af6bfc750e81c2135e84e02a' 
  AND token = 'nZoy6xf/4V74SBA4wPCrO6sp3ZV3n88iiqncxxykvQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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