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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5622e699953d197c1612e1c3ffabdab9353fd2d76b88096696ff9f523815735' 
  AND token = 'DHC8Cy3oAYqunpmKykc1ywotWR6XaAoSgen+/DxS3UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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