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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2a2a5661cd782a387e5678bc4d442d0769cd79e1b4c49ba6185af7f7ed0681' 
  AND token = 'ADNbM/PDQUKXWb35p7lm3lXIp2udajQZ4LthawAKvZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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