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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b58a3c9738ec839ed743c3948d4d45605053a3b7b627d64ae2a24c75bf0db4' 
  AND token = 'dyLA8lep+2BgpdxGOLhF5hhzoobrN8jAJrD7H9PwAvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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