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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6002d66d0256bc217044d511afa2ad0e4bbd66855a967a9c8a2071df1034ae08' 
  AND token = 'wQgwSb1702SE9qkETU+6DlboWTSWkdwI1JAwtfziVzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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