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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9690fa5ce83d517f98d2a6f1b622ce4af6d535e2b9bc5467702662a4b8f34fc8' 
  AND token = 'zPuky2/nIUu91tlz5Hs6ZxEJF84/ZOADhZRPiXZQoT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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