SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12120b97f7793e6133a8d3093d56164001db3e98da4828a20b6ab223dc9d6534' 
  AND token = 'BvwZ7fn4ambTJjDHfO4gBLVa2pGF8kZOh0+ONpPmHJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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