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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bb5c18b4abda040e5e08ac06b29611cebb15bdd1fd784b4aaa220ed62c11ad' 
  AND token = 'MOQZUqe3AATddNwcHI7n8qCZSa4wx6v+CDM02M1LvYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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