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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ca10a1f515b17546202c10342767d4bb3fa22d00a471e624b531cdefbc473b' 
  AND token = 'gDrYYh4zpIQGnVV0udsyJYE88eBgzf60Ae0yej68ByY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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