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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddef2f0c383a55b49e9cf1274a0b8e08d17f48c693e8b97ecb49fb2a0d6c439f' 
  AND token = 'hryWBzTYmDeSmWWpBlA8m0dpzI/3VSVVwAxtqiVvKck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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