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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41881c6ce75551e3e1340c24860468c9c3832ab1f8e9c20a966c24d3f9e6e523' 
  AND token = 'V3G1pnPJll2GZa0Tg+gX2ZOipEYQTXMldwZ2oZaIf5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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