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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ceb95f00fcee55bb2a3cff882ce084c0cb77ca93edd52dbee8c3d45f3cd4362' 
  AND token = 'fgceRly1GtrpIq9tbcXrhepW+afyXt5wLe3NXLJFEQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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