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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c4630a6784039b4f6fbe44c92d0ea8bd67f01979f318d8dd8a4f53a0f5fa30' 
  AND token = '8XeoVaYyIrwBo3rP2aLbDWflcdRP/Qo457pgZU0IfBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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