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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e057e681872b89ac2370375b28869065d3f0d5f43f09a89365a05558dbb7c2' 
  AND token = 'yn4wKcVP8KrJzRcDRG8KIeHOusqMNhJxLojYTOc89Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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