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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3064167cc4a942ea141626eafda689d26d9d1dd6b1d7ed5951973d867c84838' 
  AND token = 'PNLnIYeLKcfq7Lg/b9nd14C1XH3KcVdOQUhTi3/9ofA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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