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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890c0859c7bc18698297410df97b769fdec7e1b9c9178289664aca89a2228f6d' 
  AND token = 'oWPssz4hTciAbIP6JRmHluFIQZMxynZtasSpQa58KpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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