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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b06b6dc1f132f9f24340bfb32a6b9eec199688364d933274edf4ed670b952e' 
  AND token = 'QCnoMrz2ie119gOo2uUceo9KzEkN4zXw4w5jP+2iXaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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