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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d98c3f715f46de16b245ddb3111265a01b61114a89c8ae31506caaecc0ec7f' 
  AND token = '4bl8ZbMiYCLe9849+pwIo9iH90ks8nzbdKjrMhdfp7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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