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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcd821e4af249f6c17d91aade382fb02b01524f67092938fd1505e8aeb4aa91' 
  AND token = 'XCu6SCVnDxUUsErq2E0riqT+HoGREBPYQCi/cwSU+28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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