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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8c814bd332ec53afeeb09eaf55c272e7110a6aa714d2645f93cb78be0ae637' 
  AND token = '2bHrrIeXJBVUBQq80lmziAhf8kJbcLArmKBjI9DrDiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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