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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a292c4ee4170e75f00caacff6dfbc43e8698f281d5dfd7aa0fe4e70f1946968' 
  AND token = '4OIsnj+IygeH/uiTM/rO6zNPhYjjn8uUV9IUz8iSnz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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