SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2237d3ce49d091636440aa604fe2f53165f6c31ad4b682f69f52c53a20df9d26' 
  AND token = 'jCr9GDpZTx7VPEIbKZwudvLO7ZHJ1FvDG8ALU3vGxmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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