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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb510467a44fc6d4183ac62fcf28c364a2bd3e4c6b42324f97b735689d595c6f' 
  AND token = 'J4Si5OEzsuIJb5EyaHG8JiJhKONuJOpXVL49QfwaDnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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