SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7052cc5d971492e4bd86fe13e054751a434ae9cb5f555ed040833fb19ab98704' 
  AND token = 'srZJgr74YQRj+fVRW/xYf99TPimsnCOivs/jVJG/ung=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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