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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3ba790256aa878941261fff2edde4baf938628cd1b61112bc024317fb3e075' 
  AND token = '03G6ntqfasQTfsU3gBxDgZUkX5ztFagCI9C5ThsiY28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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