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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c989c7d319852f2abd28e564a10673ab09e1fbb64cad77459520d41764ef180' 
  AND token = 'OqkRG/Cq+4iXSbU1mPxU+2Ys9zG4xHGpUgYNYHeXxdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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