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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c81810774dcc00a547f43fdce38f08c9e60f4e8a8a89c3e4e4cf40e84913e2' 
  AND token = 'zURlftQI9C87n6ltcYTiTH0d4vm9ZMveCPT5Zs3vbwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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