SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7218d824d3d4bb1fee3b440505ae5d9cf60e8098f8743e702a9ea27f6f0f6d' 
  AND token = '9S1W6/GBOVOqok6psmM3/vzGjELFfv/s5SJQL2KQWaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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