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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b88fa76154275ea1c0324afb98b043f1ea95c4c0efd14cce39bda3087514b5' 
  AND token = 'WZBnFrvIO5ZarBWjkFChhLWv6ck0XvgAl4YY+9gdtcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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