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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6185073969d15bea1a8b489a136ef1a89577638a457d5c7613bb6a023d411366' 
  AND token = 'tww6IJMmwURNj9wI37M9VZpzeZ5Xlkrth2gQ0djRv2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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