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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986d9b62c8cd6c5c5f945d5e8dfff13ca92a3ddee1a20378d5c1538ca4f8f851' 
  AND token = 'lzd6Cdihu5Fr6Q91l4hHmWBfeqXHKCbRVCqH+/v886I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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