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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c09ac0da31fc8931daa075fd0462ca009b4e079cb44aa37954253a208f90886' 
  AND token = 'NbMxM40qCLDBZ92Vm0QtQzBI6As6qyy/yN5jL/B8/bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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