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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a965ab0236d7e6ee3c1a20b5a3f8092316998fad27676a59967d57a950a0428e' 
  AND token = '3KyGb2wctvDRxGwV3Rf59bNDBRpl5LuE6Cyf31WdiAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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