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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ec10de42b894701026b92f3c761420cc4773277eeabebab6b5d8c8ef301c8d' 
  AND token = 'xwRVC0p6vZDghnzh1I38kxv/CHii7ONqRA/TomR0N6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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