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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d772b2e9becda465a1a07529410795b523bb1fd4a0e03b676b598375ffcfb9' 
  AND token = 'gaSPT7ghizsUlJ0HxRemGfcy9O8tRtdase3dkY5qGUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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