SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f662407a8c85e291f0ba54f428ed252142fbbe47f97fb6432646f6d86317a763' 
  AND token = 'vgmmEJmZWh9Qf1flOUukiziq117mw/HpLbIA2Epljtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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