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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67955a9c8a8a0c394264781a79e6396952d4e7034729e65fd5ca910d94b9b7b' 
  AND token = 'vDuAhHRvruFCrJ8PcMw605jQ142ICX0Ps/LJQ0xMOqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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