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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34924d99b1e3a5c8b8e2af202b3d3ae6dd75e0a254136a3916703ad1e23a3c2a' 
  AND token = 'vN9NVn9nTO++geGAcA4S1uimzONubEG54ZipixqfE9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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