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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37c59ba0828b9063258f7913a8a335b5f0c3b62b400c9f45de2d1c72e407f70' 
  AND token = 'xUWC+TgKVbfoZudbbxByT+PlDlLDv+fddN+qSw0ka+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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