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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c03036c362e3953c458f0b7a65c7ca030b860ca612866bb0b8796fd56100d0' 
  AND token = 'kujkyE3okSwntNx3szA0om0xu5FF9Xf5CfUYWvLWrs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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