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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9edef5cda0cc0c7c3553414f61fe5ba1abe805da99e69243150ba635d1ebf4df' 
  AND token = 'WxvkEa0RYBPe79EXT9dnSC8djfeCEHRpetcJOys8dxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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